| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a nonoriented silicon steel sheet high in magnetic flux density and used for the iron core material of electric apparatus. SOLUTION: This method for producing a nonoriented silicon steel sheet high in magnetic flux density is the one in which a steel having components contg., by weight, >0.10 to 2.00% Si, 0.1 to 1.0% Mn, 0.10 to 1.00% Al, <=0.0050% C, <=0.0050% N, <=0.0050% S, and the balance Fe with inevitable impurities is subjected to hot rolling to form into a hot rolled sheet, which is applied with insulated coating or is not applied with this to form into a final product. In this case, at the time of the finish hot rolling, it is executed in such a manner that the strain rate per at least one pass is regulated to >=150s<-1> and the tension between at least one set of stands is regulated to >=1.5kgf/mm<2> , and the finish hot rolling finishing temp. is regulated to 750 deg.C to (Ar3 +Ar1 )/2 or below. Furthermore, the sheet bars after rough rolling by the hot rolling are joined, which is subjected to the continuous finish hot rolling. |
